The Greeks had a word for this: apatheia. It’s the kind of calm equanimity that comes with the absence of irrational or extreme emotions. Not the loss of feeling altogether, just the loss of the harmful, unhelpful kind. Don’t let the negativity in, don’t let those emotions even get started. Just say: No, thank you. I can’t afford to panic.

Equanimity: The Collins dictionary definition of equanimity is “calmness of mind or temper; composure”.